<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <link href="01.css" type="text/css" rel="stylesheet">
</head>
<body>
<h1>应用样式表</h1>
<a>这是一个a标签的样式</a>
<h2>h2样式</h2>
<h3>h3样式</h3>
hello css
<p>hello css3</p>
</body>
</html>